Method of pectus excavatum measurement based on structured light technique

We present an automatic method for assessment of pectus excavatum severity based on an optical 3-D markerless shape mea- surement. A four-directional measurement system based on a struc- tured light projection method is built to capture the shape of the body surface of the patients. The system setup is described and typical mea- surement parameters are given. The automated data analysis path is explained. Their main steps are: normalization of trunk model orien- tation, cutting the model into slices, analysis of each slice shape, se- lecting the proper slice for the assessment of pectus excavatum of the patient, and calculating its shape parameter. We develop a new shape parameter I3ds that shows high correlation with the computed to- mography CT Haller index widely used for assessment of pectus excavatum. Clinical results and the evaluation of developed indexes are presented. © 2009 Society of Photo-Optical Instrumentation Engineers.